NPS 22 Pipe Dimensions
Outside diameter 22.000 in (558.8 mm) — fixed across every schedule. 12 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 22
- Metric designator
- DN 550
- Outside diameter
- 22.000 in (558.8 mm)
- Schedules listed
- 12
- Standard weight wall
- 0.375 in (9.5 mm)
- Extra strong wall
- 0.500 in (12.7 mm)
Every schedule in NPS 22
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Flow area (in²) | Water (US gal/ft) |
|---|---|---|---|---|---|
| Sch 5 | 0.1884.78 mm | 21.624549.25 mm | 43.8065.18 kg/m | 367.25 | 19.078 |
| Sch 10 | 0.2185.54 mm | 21.564547.73 mm | 50.7175.47 kg/m | 365.21 | 18.972 |
| Sch 20 | 0.3759.52 mm | 21.250539.75 mm | 86.61128.89 kg/m | 354.66 | 18.424 |
| Sch 30 | 0.50012.70 mm | 21.000533.40 mm | 114.81170.86 kg/m | 346.36 | 17.993 |
| STD | 0.3759.52 mm | 21.250539.75 mm | 86.61128.89 kg/m | 354.66 | 18.424 |
| Sch 60 | 0.87522.22 mm | 20.250514.35 mm | 197.42293.79 kg/m | 322.06 | 16.731 |
| Sch 80 | 1.12528.57 mm | 19.750501.65 mm | 250.82373.26 kg/m | 306.35 | 15.915 |
| XS | 0.50012.70 mm | 21.000533.40 mm | 114.81170.86 kg/m | 346.36 | 17.993 |
| Sch 100 | 1.37534.92 mm | 19.250488.95 mm | 302.88450.74 kg/m | 291.04 | 15.119 |
| Sch 120 | 1.62541.27 mm | 18.750476.25 mm | 353.61526.24 kg/m | 276.12 | 14.344 |
| Sch 140 | 1.87547.62 mm | 18.250463.55 mm | 403.01599.74 kg/m | 261.59 | 13.589 |
| Sch 160 | 2.12553.97 mm | 17.750450.85 mm | 451.07671.27 kg/m | 247.45 | 12.855 |
Weight is calculated for carbon steel as w = 10.6802 × t × (OD − t) lb/ft and is the plain-end weight, excluding coatings, linings and fittings.
Standard weight equals Schedule 20 in this size. Extra strong equals Schedule 30.
This size, schedule by schedule
A page for each combination, with bore, weight, water capacity and the matching flange and fitting data.
This size in a schedule chart
Common questions
What is the outside diameter of NPS 22 pipe?
NPS 22 pipe has an outside diameter of 22.000 in (558.8 mm). That outside diameter is fixed: it is identical in every schedule, and only the wall thickness — and therefore the bore — changes from one schedule to the next.
How much does NPS 22 schedule 40 pipe weigh?
86.61 lb/ft (128.89 kg/m) as plain-end carbon steel, on a wall thickness of 0.375 in (9.5 mm).
What is the metric equivalent of NPS 22?
DN 550. DN is a dimensionless designator, not a measurement — DN 550 pipe does not measure 550 mm anywhere. Its actual outside diameter is 558.8 mm.